Question: Which  is farthest north of place held by Balkans Campaign?
Paraphrase: Which is most remote north of put held by Balkans Campaign?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q789406 wdt:P276 ?X . ?X wdt:P1332 ?answer}
Answer: Point(26.7 48.27), Point(22.67 44.22), Point(19.67 46.18)